<分区>
我正在使用下面的代码捕获绘图。为了更改笔触颜色或宽度，我调用了 setPaintAttribute() 方法。但是当我改变颜色时，整个图画都会改变，包括我之前画的线条。我怎样才能改变油漆的颜色并保持以前的图纸不变？我尝试创建一个新路径，但之前的绘图消失了。
public void setPaintAttributes(float STROKE_WIDTH, int color)
{
paint=new Paint();
paint.setAntiAlias(true);
paint.setColor(color);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(STROKE_WIDTH);
}
public boolean onTouchEvent(MotionEvent event) {
scrollView.requestDisallowInterceptTouchEvent(true);
btnSaveSignature.setEnabled(true);
btnSaveSignature.setBackgroundResource(R.drawable.save);
float eventX = event.getX();
float eventY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
path.moveTo(eventX, eventY);
lastTouchX = eventX;
lastTouchY = eventY;
return true;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
resetDirtyRect(eventX, eventY);
int historySize = event.getHistorySize();
for (int i = 0; i < historySize; i++) {
float historicalX = event.getHistoricalX(i);
float historicalY = event.getHistoricalY(i);
path.lineTo(historicalX, historicalY);
}
path.lineTo(eventX, eventY);
break;
}
invalidate((int) (dirtyRect.left - HALF_STROKE_WIDTH),
(int) (dirtyRect.top - HALF_STROKE_WIDTH),
(int) (dirtyRect.right + HALF_STROKE_WIDTH),
(int) (dirtyRect.bottom + HALF_STROKE_WIDTH));
lastTouchX = eventX;
lastTouchY = eventY;
return true;
}
private void resetDirtyRect(float eventX, float eventY) {
dirtyRect.left = Math.min(lastTouchX, eventX);
dirtyRect.right = Math.max(lastTouchX, eventX);
dirtyRect.top = Math.min(lastTouchY, eventY);
dirtyRect.bottom = Math.max(lastTouchY, eventY);
}